ITSP requires Invite via header to have a public IP- How To?

[helia]

We're having an issue with some calls not completing based on how an end carrier transfers calls using a re-invite. I'm told that the via header in the invite must have a public ip.

Here is an invite fragment from a call initiating from 3CX Phone on ver 15.5

20 Jun 18:03:10.641/GLOBAL/ser[78068]: RECEIVED message from 216.171.235.98:5060:
INVITE sip:[email protected]:5060 SIP/2.0
Via: SIP/2.0/UDP 10.100.95.24:5060;branch=z9hG4bK-524287-1---aa2a8d3c8d523877;rport
Max-Forwards: 70
Contact: <sip:[email protected]:5060>
To: <sip:[email protected]:5060>
From: "4037751490"<sip:[email protected]:5060>;tag=c906bb2a

The 10.100.95.24 is the internal IP of 3CX.

How can I get this via header to show the static public ip address of 3cx instead of the private ip address?

 

[cobaltit]

This would be the 'Options' tab of your SIP trunk....